Parametric Spline
Parametric Spline
(OP)
What are peoples thoughts on how to create a parametric spline that is related to other arcs and curves. I believe the splines should be created in a sketch along with the arcs and curves. Attached is a sample shape that I want to replicate and make parametric.





RE: Parametric Spline
RE: Parametric Spline
I think Jerry has a good workflow described above, and that can be applied to Studio Spline by poles as well, although I usually let the poles move freely and adjust by hand while referencing a curvature comb of the spline.
Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com
Some people are like slinkies....they don't really have a purpose, but they still bring a smile to your face when you push them down the stairs.
RE: Parametric Spline
Best Regards
Hudson
RE: Parametric Spline
-Dave
Everything should be designed as simple as possible, but not simpler.
RE: Parametric Spline
As long as the version in model space works as well as it does I doubt that there really is all that much missing functionality.
Best regards
Hudson
RE: Parametric Spline
I have not tried these within a sketch, but I know they work well outside of one. If you are not familiar with bridge curves, they are associative to other string entities (lines, arcs, even other splines) and let you define tangency or curvature continuity at the ends. There are even shape controls that let you tweak the shape of the middle section of the curve.
RE: Parametric Spline
Regards
Hudson
RE: Parametric Spline
I think the wandering has been fixed with Studio Spline, for the most part. The curve plane tool on the dialog seems to actually work a bit better now in NX5. However, I could be mistaken, as I did run into this anomaly a few times, but not enough to warrant in-depth testing. Creating a new spline usually fixed any issues.
Tim Flater
Senior Designer
Enkei America, Inc.
www.enkei.com
Some people are like slinkies....they don't really have a purpose, but they still bring a smile to your face when you push them down the stairs.
RE: Parametric Spline
I dont want to get a whole discussion going again about ProE, but I am too familar with ProE's creation ability and associativity of a spline within the sketch environment. What I dont understand is why you would create arcs and curves in a sketch then use another feature to create the spline or bridging curve outside of the sketch. This starts to add complexitiy to a model tree, plus I like to keep things grouped together.
Im gonna look at the bridge curve now.
RE: Parametric Spline
Bridge curve and associative splines both live in the tree and are completely history based. The reason they don't live exclusively in the sketcher would be that they can be defined in 3D space, i.e. non-planar as well, so while having the same functionality in the sketcher would be good, but also a double up.
There are so many non-sketch based uses for these curves that require 3D, as to make the non-sketcher version the essential progenitor of any other and more limited functionality that would only work in 2D.
for what it's worth the studio spline is more capable but the bridge curve often easier. They both have their place and the geometry may not be identical since the methods do vary how and where inputs are constrained.
best regards
Hudson
RE: Parametric Spline
John R. Baker, P.E.
Product 'Evangelist'
NX Design
Siemens PLM Software Inc.
Cypress, CA
http://www.siemens.com/plm
http://www.plmworld.org/museum/
RE: Parametric Spline
Thanks for telling us the underlying reason. It is back to the old issue of 'unlearning the old and learning the new'. Thats why I wanted to see experienced peoples thoughts.